#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int find_1(int n)
{
    int count = 0;
    while (n)
    {
        n = n & (n - 1);
        count++;
    }
    return count;
}

int main()
{
    int n = 0;
    scanf("%d", &n);
    int ret = find_1(n);
    printf("%d\n", ret);

    return 0;
}